To add just a bit more: Chrysler and Jeep actually use WK as the model designation for BOTH the 2005-2010 and 2011-2016 versions. It is the fans like us that have designated WK2 for the 2011-16 model, to distinguish them.

During the Sept. 8 Jeep Engineer's chat session, they mentioned that using the same letter designation (WK) for both models was a Daimler thing, and that Jeep would not do it again in future.